Method of forming a pimp valve



. Dec. 17, 1940. l J. J. O'HARE I METHOD 0F FORMING A PUMP VALVE Filed Aug. 1'7, 1937 www- ' INVENTR JoH/vd. O/A E BY 27% Kq ATTORNEY Patented Dec. 17, 1940 UNITED. STATES PATENT OFFICE y 2,225,081 METHOD oF FORMING A PUMP VALVE John J. OHare, North Brookfield, Mass., assignor to Voorhees Rubber Mfg. Co., Inc'., New York, N. Y., a corporation of Delaware Application August 17, 1931, serial No; 159,453

1 claim.

inforced by a flexible grooved metal disc or the like in which the parts proper are bonded or united during the vulcanizing process.

It is still another object of the present invention to provide an improved method for producing an improved pump valve consisting in the formation of a reinforced disc having an uneven surface, cleaning the surface thereof with an alkalizing agent, brass-plating the same, dipping l5 the same in hot water, drying it with hot air, then positioning it between two crude rubber discs and thereupon pressing all threey discs together in a` mold and thereupon vulcanizlng the rubber discs in turn to cause the bonding of the rubber 2o discs to the metal disc.

vIt is still another object of the present inven tion to provide an improved pump valve composed of a rubber disc reinforced by a grooved metal disc composed of pitted hot rolled pickled steel or cold rolled steel.

It is still another object of the present invention to provide an improved method for producing a rubber pump valve reinforced with a metal disc consisting in dipping a grooved, pitted, hot

rolled pickled. steel disc provided with a central opening in a hot alkaline solution, then rinsing the same with hot water, then electro-plating the same with a brass composition, then again rinsing in hot Water, drying with hot air, selecting two crude rubber discs slightly larger in diameter than said metal disc and having a central opening slightly smaller in diameter than the central opening of said metal disc, wiping ofi' the rubber discs with high test gasoline, placing the steel 40 disc so preparedv between the two rubberdiscs selected, positioning all three discs so placed in a mold, placing the mold in a hydraulic steam platen vulcanizing press, subjecting the mold to a pressure of about iive hundred pounds to the square inch and finally nishing the valve by trimming oil the ns in the usual way after the vulcanization is completed.

These and other features, capabilities and advantages of the invention will appear from the subjoined detail description of the steps of the method constituting one part of the present invention and of specific embodiments ofthe valve sov produced illustrated in the accompanying drawing in which y 9 which arepreferably wiped-oi! witha high Figure 1 is a perspective partly broken away of a finished valve:

Figs. 2, 3, 4, 5, 6, 7, 9 and 10 are fragmental planspf inserts made according to the present invention; 5

Fig. 2A is a fragmental section of the embodiment shown in Fig. 2; and

Fig. 8 is a transverse section of a mold containing valve parts in the coursev of manufacture.

In contriving the method of the present invenl0 tion, there has been achieved not only a reduction in the cost of production to a minimum but also elimination of health hazards and unnecessary and objectionable labor whenever possible. As an instance, in the manufacture of like pump 15 valves, it has been customary to prepare the reinforcement disc by sand blasting, a. cold rolled steel plate before electroplating the same with a brass composition. Sand blasting is not only a `health hazard but also unpleasant and slow to 20 handle, entailing an expensive operation on account of the power necessary, the time required and the wear and tear on the equipment used.

,According to the present invention, it has been found that a perfect bond is` provided in the 25 vulcanization process when the steel inserts consist of a pitted hot rolled pickled plate, such as the disc I preferably grooved with the rectangular intersecting grooves 2 shown in Fig. 2 or the obliquely intersecting grooves 3 of Fig. 3,- the 30 transversely extendinggrooves I of Fig. 4, the radially extending grooves I of Fig. 5, the annular grooves G of Fig. 6 or the hyphenated annular grooves 'I of Fig. 7.

It has been found to advantage touse grooves 35 that terminate preferably in the outer periphery lof the disc to prevent the formation of air pockets and the like, the grooves so terminating in the periphery adequately permitting the escape of air and gases when the metal disc is sand- 40 wiched between the crude rubber discs Band 9 as an instance. The pickled hot rolled steel disc I is of course free from scale and after the grooves aforesaid are formed in the same preferably by stamping or the like, it will then only be 45 necessary to dlp the same in a hot alkaline solution, such as Oahte or a suitable trisodium phosphate solution to remove the grease and dirt, then rinse the same in clear hot water, then preferably dry the same with a blast of hot air, then '5o electro-plate the same with a brass composition whereupon the same are ready to be sandwiched as aforesaid between the crude rubber discs 8 and test gasoline. 55

The length of the grooves and particularly the hyphenated grooves I may vary from so-called dimples to fairly long dashes as shown and the depth of the same may also vary although prefer- 5 ably about one-thirty-second of an inch deep. These grooves are preferably also spaced from one another a distance of one-sixteenth of an inch to one-eighth of an inch from center to center of successive parallel grooves. While the grooves are preferably stamped and their tensile and shear strengths are thereby increased about twenty per cent, they may for certain purposes be formed in a wide variety of ways, such as by molding, machining, acid etching or the like.

The purpose of the grooves, as wellas the pits ofthe pitted pickled plateis to extend or increase the surfaces available for electro-plating, in turn thereby extending or increasing to a. maximum the regions or areas where the chemical bonding takes place between the metal disc or insert and the rubber discs. When the diameter of the disc or insert does not exceed two and seven-eighths inches with a central opening of one-half inch in diameter, the area of a 25 grooved surface according to the present invention can be extended from an approximate 6.185

square inches for a plain grooved surface to 9.056

square inches for a grooved surface, thus presenting almost a ifty per cent increase in bonding area for a given sized disc asY compared to the plain type with the consequent increased bonding efliciency. ,x

Furthermore, the saving in cost in the production of these metal inserts or discs in quantities of one hundred or more when the diameter does not exceed two and seven-eighths inches by actual calculation with present prices of material and labor is over forty per cent, let alone the elimination of the health hazard accompanying sand blasting and the speeding up of production.,

As shown in Fig. 8, preferably for the production of a pump valve two and seven-eighths inches in diameter, the discs 8 and 9 of crude rubber each will have a diameter of about two and seven-eighths inches with a central opening of about one-quarter of an inch in diameter and a thickness of about one-quarter of an inch, and

' the 'metal insert I will have a' diameter of about two and i'lve-eighths inches with a central opening of about one-half inch in diameter and a thickness of about one-sixteenth inch to threethirty-seconds of an inch.

The disc 9 of a pair will first be placed in a cavity ID of a mold Il having a plurality of such cavities I0, the-diameter of the cavity I0 corresponding in diameter to the diameter of the disc 9. Thereupon the insert I will be positioned so that its centr'al opening will be concentric with the central opening of the rubber disc 9 and the inner peripheries thus be spaced fromvone another approximately one-eighth of an inch and the outer peripheries similarly thus spaced from one another approximately one-eighth of an inch. Thereupon, the other rubber disc 8 will be placed on top of the disc I and centered by the cavity III. Preferably as shown, the depth of the cavity I0 will correspond to the combined thickness of the two rubber discs 8 and 9, allowing a compression of one-sixteenth inch to threethirty-seconds inch corresponding to theI thickness of the steel insert. It is of course understood that each of the cavities Il! in the mold II temperature continued for about ten tol thirty minutes when the molds will be removed, allowed to cool and the ns trimmed off in the usual way.

In order to obtain the best bonding effect, different ingredients may be added to the rubber and the plating composition. As an instance, excellent results have been achieved when stearic acid is mixed in the rubber compound instead of the palm oil generally used. Furthermore, when red rubber discs are used, it has been found preferable to add a small percentage of antimony to the brass composition andwhen especially hard rubber is used, carbonate copper is preferably added to the rubber compound as well as golden or crimson antimony to the rubber compound.

While the grooved product may be preferred, it is not intended here to be limited to the grooved product. Furthermore, instead of grooves, depressions may be formed in the disc I such as pebbles or dimples I3 of Fig. 9, or a combination of grooves and dimples such as shown in Fig'. l0 having intersecting rectangular grooves I4, arcuate grooves I5 and dimples or pebbles I6.

It is of course obvious that various changes and modications may be made to the details of the product and in the steps of the method without departing from the general spirit of the invention as set forth in the appended claim.

The method of forming a reinforced pump valve consisting in stamping grooves into the opposite faces of, and into a pitted hot rolled pickled steel disc thereby to form grooves on both faces of the disc and to increase the tensile and shear strengths of the initially hot rolled disc, thereupon immersing the-:steel disc in an alkaline solution to remove grease and dirt, thereupon 4electro-plating the steel disc with a brass composition, said plating being co-extensive with and following the contour of the stamped disc, thereupon sandwiching the steel disc between two slightly larger crude rubber discs'and thereby embedding the steel disc in and between the crude rubber discs, and ilnally adhesively bonding by vulcanization the rubber discs to one another and to said steel disc while the steel disc is so embedded.

JOHN J. OHARE. 

